Every sewing machine is different and different fabrics and needles can react differently every time that you sew. One of the easiest and simplest things that you can do to make your sewing experience better is to just do a few sample stitches before you start any sewing project. That will ensure that your stitches are all even and looking as you want before you start to sew on the actual fabric.
All you have to do is get a piece of scrap fabric and test one of each type of stitch so that you can see how it works.